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The Single UNIX &reg; Specification, Version 2<br>
Copyright &copy; 1997 The Open Group

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<h4><a name = "tag_000_010_238">&nbsp;</a>NAME</h4><blockquote>
umask - set and get file mode creation mask
</blockquote><h4><a name = "tag_000_010_239">&nbsp;</a>SYNOPSIS</h4><blockquote>
<pre><code>

#include &lt;<a href="systypes.h.html">sys/types.h</a>&gt;
#include &lt;<a href="sysstat.h.html">sys/stat.h</a>&gt;

mode_t umask(mode_t <i>cmask</i>);
</code>
</pre>
</blockquote><h4><a name = "tag_000_010_240">&nbsp;</a>DESCRIPTION</h4><blockquote>
The
<i>umask()</i>
function sets the process' file mode creation mask to
<i>cmask</i>
and returns the previous value of the mask.
Only the file permission bits of
<i>cmask</i>
(see
<i><a href="sysstat.h.html">&lt;sys/stat.h&gt;</a></i>)
are used; the meaning of the other bits is implementation-dependent.
<p>
The process' file mode creation mask is used during
<i><a href="open.html">open()</a></i>,
<i><a href="creat.html">creat()</a></i>,
<i><a href="mkdir.html">mkdir()</a></i>
and
<i><a href="mkfifo.html">mkfifo()</a></i>
to turn off permission bits in the
<i>mode</i>
argument supplied.
Bit positions that are set in
<i>cmask</i>
are cleared in the mode of the created file.
</blockquote><h4><a name = "tag_000_010_241">&nbsp;</a>RETURN VALUE</h4><blockquote>
The file permission bits in the value returned by
<i>umask()</i>
will be the previous value of the file mode creation mask. The state
of any other bits in that value is unspecified, except that a
subsequent call to
<i>umask()</i>
with the returned value as
<i>cmask</i>
will leave the state of the mask the same as its state before
the first call, including any unspecified use of those bits.
</blockquote><h4><a name = "tag_000_010_242">&nbsp;</a>ERRORS</h4><blockquote>
No errors are defined.
</blockquote><h4><a name = "tag_000_010_243">&nbsp;</a>EXAMPLES</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_010_244">&nbsp;</a>APPLICATION USAGE</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_010_245">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_010_246">&nbsp;</a>SEE ALSO</h4><blockquote>
<i><a href="creat.html">creat()</a></i>,
<i><a href="mkdir.html">mkdir()</a></i>,
<i><a href="mkfifo.html">mkfifo()</a></i>,
<i><a href="open.html">open()</a></i>,
<i><a href="sysstat.h.html">&lt;sys/stat.h&gt;</a></i>,
<i><a href="systypes.h.html">&lt;sys/types.h&gt;</a></i>.
</blockquote><h4>DERIVATION</h4><blockquote>
Derived from Issue 1 of the SVID.
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UNIX &reg; is a registered Trademark of The Open Group.<br>
Copyright &copy; 1997 The Open Group
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